What is the average of the squares of the first 19 natural numbers?
(A) 130
(B) 133.5
(C) 124
(D) 127.5
Three numbers are such that the average of first two numbers is 2, the average of the last two numbers is 3 and the average of the first and the last numbers is 4, then the average of three numbers is equal to.
(A) 3
(B) 2.5
(C) 2
(D) 3.5
There are 100 students in 3 sections A, B and C of a class. The average marks of all the 3 sections was 84. The average of B and C was 87.5 and the average marks of A is 70. The number of students in A was.
(A) 20
(B) 25
(C) 30
(D) 35
The average weight of a group of 20 boys was calculated to be 89.4 kg and it was later discovered that one weight was misread as 78 kg instead of 87 kg. The correct average weight is
(A) 89.55 kg
(B) 89.85 kg
(C) 88.95 kg
(D) 89.25 kg
Among three numbers, the first is twice the second and thrice the third. If the average of the three numbers is 49.5, then the difference between the first and the third number is:
(A) 39.5
(B) 41.5
(C) 54
(D) 28
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